Patent US3721574A successfully refreshed from Google Patents.
US3721574A
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Silicate coatings compositions
Assignee: Individual
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Filing: 1968-08-06
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Granted: 1973-03-20
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Expires: 1988-08-06
Abstract
Abstract Water resistant and air-drying alkali metal silicate coatings contain a base of an alkali metal silicate solution having a high molar ratio of solvated silica to alkali metal oxide. To this base is added colloidal silica in amounts to increase the SiO2: alkali metal oxide mole ratio to as high as 9:1. The compositions are advantageously modified with silane wetting agents and multivalent metal ions, e.g., calcium. Ultimately, the coatings may be modified with various materials such as tetrafluoroethylene polymer or zinc.
Inventors
- 👤 R Schneider
- 👤 J Schutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:33
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C09; C09D; C09D1/00; C09D1/02; C09D1/04; C04B2111/00; C04B2111/00474; C04B2111/00482
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
22 words
The coatings composition of claim 1 wherein said colloidal silica has a small amount of aluminum oxide thereon as a surface coating.
Claim 2
Dependent Claim
23 words
The coatings composition of claim 1 up to about 10 percent by weight of said colloidal silica is modified with hydrophobic hydrocarbon groups.
Claim 3
Dependent Claim
12 words
The coatings composition of claim 1 including a dispersed solid bulking material.
Claim 4
Dependent Claim
22 words
The composition of claim 4 wherein said bulking material is selected from the group consisting of stainless steel flakes and aluminum powder.
Claim 5
Dependent Claim
26 words
The coatings composition of claim 4 wherein said bulking material comprises zinc dust present in amounts up to 95 percent by dry weight of said composition.
Claim 6
Dependent Claim
35 words
The coatings composition of claim 1 containing a material contributing a multivalent metal ion of a metal selected from the group consisting of calcium, magnesium and lead, to coordinate the silicon atoms of said coating.
Claim 7
Dependent Claim
146 words
A zinc-modified coating composition comprising: a coating vehicle mixture consisting essentially of an alkali metal silicate solution having an SiO2:M2O molar ratio of at least about 3-to-1; and colloidal silica dispersed in such solution in an amount sufficient to provide an overall SiO2:M2O ratio of at least 5-to-1; and a difunctional, trifunctional or quadrifunctional water soluble hydrocarbyl polyoxyalkyl silane selected from the group consisting of (1) dialkyl dialkoxy silanes, (2) alkyl trialkoxy silanes, (3) aryl trialkoxy silanes, (4) alkoxyalkyl trialkoxy silanes and (5) compounds as specified in (1) through (4) above containing an oxirane oxygen group on the hydrocarbyl portion or the alkoxy portions of such compounds; said mixture having a pH less than about 11, and having a solids content less than 25 percent by weight; and zinc dust in an amount to provide up to 96 percent of the dry weight of said composition.
Claim 8
Dependent Claim
18 words
The composition of claim 8 wherein the SiO2:M2O mole ratio of said vehicle is between 6:1 and 9:1.
Claim 9
Dependent Claim
121 words
A fireproof coating composition comprising: a coating vehicle mixture consisting essentially of an alkali metal silicate solution having an SiO2:M2O mole ratio between about 3:1 and 4:1, and colloidal silica having a surface coating of Al2O3 in an amount sufficient to provide said mixture with an overall SiO2:M2O mole ratio between about 5:1 and 6:1; a difunctional, trifunctional or quadrifunctional water soluble hydrocarbyl polyoxyalkyl silane selected from the group consisting of (1) dialkyl dialkoxy silanes, (2) alkyl trialkoxy silanes, (3) aryl trialkoxy silanes, (4) alkoxyalkyl trialkoxy silanes and (5) compounds as specified in (1) through (4) above containing an oxirane oxygen group on the hydrocarbyl portion or the alkoxy portions of such compounds; and finely divided mica as a bulking agent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |